For fitting fan to filter we recommend using either a short piece of ducting or purchasing a Padded Collar

PLEASE NOTE: Systemair 315mm LP Fan requires simple wiring.

To calculate the size of fan & filter you will require: Simply multiply the length x width x height of your grow room in mtrs which will give you the cubic capacity of your room ..and then multiply that value by either 30 or 60 which is the minimum and maximum air changes required per hour for optimum ventilation in your grow room.

For example: A grow room measuring 2mtrs x 2mtrs x 2mtrs = 8mtrs cubed x30 air changes an hour = 240mtr cubed per hour will need to be ventilated ..as a rule we recommend buying a slightly larger capacity fan than you need, to allow for summer increases in temp and or using a Carbon filter.